Dear jandj, Pegasus is a kinda lowcoster - they serve nothing for free, but you may pay a beer at their prices onboard.
I think taking your bear on the plane makes no problem, I'd try, however I am not sure...

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Don't shoot the piano man - he's playing at his best.

Cheers for all the info. I asked on a Turkish Airlines flight to Istanbul for a beer and was told, no alcohol on board. I was hoping to carry on a beer because Pegasus charge a fortune for a small can. But do the "no liquids" rule apply for internal flights.